Examine source code of LyricPop

{
  "manifest_version": 2,
  "name": "LyricPop",
  "version": "1.0",
  "description": "Search lyric snippet from selected text.",
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab",
    "scripting"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      },
      "id": "@lyricpop-example",
      "strict_min_version": "109.0"
    }
  }
}